<p>I'm going to assume that you are tired.</p>
<p>Yes, the server sends a <code>cache-control</code> + <code>expiry</code> but It does not matter, since it never sends either an <code>eTag</code> nor <code>Last-Modified</code> which means that the browser has no value to include with an <code>If-None-Match</code> nor an <code>If-Modified-Since</code> nor anything else.</p>
<blockquote>
<p>TomH<br>
(and now an irrelevant last modified).</p>
</blockquote>
<p>If the server does not send a <code>Last-Modified</code> value, how the heck is the browser supposed to know what value to add to it's <code>If-Modified-Since</code> header?!!!</p>
<p>As I said at the top, I'm going to assume that you are tired.</p>

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